package org.csmzxy.class2333;

public class Test3 {
    public static int fbnq(int a){ //获取斐波那契
        int total=2;
        int qian=1;
        int hou=1;
        for(int i=3;i<=20;i++){
            int zui=qian+hou;
            total+=zui;
            qian=hou;
            hou=zui;
        }
        return total;
    }
    public static void main(String[] args){
        System.out.println(fbnq(20));
    }
}
